Incorporate BlobChannel into Blimp image encode/decode pipeline.

blimp/engine/mojo/blob_channel.mojom

Index: blimp/engine/mojo/blob_channel.mojom
diff --git a/blimp/engine/mojo/blob_channel.mojom b/blimp/engine/mojo/blob_channel.mojom
index fe3ebb9dc4734f6a6950387739cc04afc5f7b899..0960916fea10655f4e3511b8e2c1684108c08ace 100644
--- a/blimp/engine/mojo/blob_channel.mojom
+++ b/blimp/engine/mojo/blob_channel.mojom
@@ -6,11 +6,13 @@ module blimp.engine.mojom;
 
 interface BlobChannel {
   // Stores the blob |id| in the BlobCache.
-  Put(string id, array<uint8> data);
+  // TODO(kmarshall): Use shared memory for more efficient data transfer, see
+  // crbug.com/614564 .
+  PutBlob(string id, string data);
 
   // Requests that the BlobChannel push the blob |id| over the wire.
   // The request will be ignored if the BlobChannel knows that
   // the client already has the data.
-  Push(string id);
+  DeliverBlob(string id);
 };